Fe5Mo Cluster with Iron-Carbide and Molybdenum-Carbide Bonding Motifs: Structure and Selective Alkyne Reductions

Chris Joseph; Subramaniam Kuppuswamy; Vincent M Lynch; Michael J Rose

doi:10.1021/acs.inorgchem.7b02615

Fe₅Mo Cluster with Iron-Carbide and Molybdenum-Carbide Bonding Motifs: Structure and Selective Alkyne Reductions

Inorg Chem. 2018 Jan 2;57(1):20-23. doi: 10.1021/acs.inorgchem.7b02615. Epub 2017 Dec 18.

Authors

Chris Joseph¹, Subramaniam Kuppuswamy¹, Vincent M Lynch¹, Michael J Rose¹

Affiliation

¹ Department of Chemistry, The University of Texas at Austin , Austin, Texas 78712, United States.

PMID: 29251494
DOI: 10.1021/acs.inorgchem.7b02615

Abstract

Herein we report the synthesis, X-ray structure, and characterization of the title pentairon (molybdo)carbido cluster. The reaction of the pentairon (μ₅-carbido) dianion [Fe₅(μ₆-C)(μ₂-CO)₂(CO)₁₂]^2- (1) with [Mo(CO)₃(chpt)] (chpt = cycloheptatriene) forms the heterohexanuclear cluster [K(benzo-18-crown-6)]₂[Fe₅Mo(μ₆-C)(μ₂-CO)₃(CO)₁₄] (2). The dianion exhibits a Fe₅Mo(μ₆-C) core structure supported by three bridging (ν_CO = 1788 cm^-1) and terminal (ν_CO = 1943 cm^-1) CO ligands. Cluster 2 provides the selective reduction of diphenylacetylene to cis-diphenylethylene via a spectroscopically observed cluster-hydride intermediate (¹H NMR: δ -26).